Valve-grinder.



P. J. McCULLOUGH.

VALVE GRINDER.

APPLICATION FILED MAR. 25, 1916.

Patented Oct. 24, 1916.

PAUL J. MOCULLOUGH, OF ST. LOUIS, MISSOURI. I

VALVE-GRINDER.

aoaioo.

Specification of Letters Patent.

Patented @ct. 24% rate.

Application filed March 25, 1916. Serial No. $6,756.

To all whom it may concern:

Be it known that 1, PAUL J. MCOULLOUGH, a citizen of the United States, residing at St. Louis, Missouri, have invented a certain new and useful Improvement in Valve Grinders, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to devices that are used for grinding valves of the type that have a substantially disk-shaped liead provided with a beveled edge and with a stem arranged at right angles to the head, such, for example, as the puppet valves now generally used in internal combustion engines.

The main object of my invention is to provide a valve rinder that will grind a valve quickly and accurately, and which is so designed that it can be used successfully by a workman of average skill.

Another object is to provide a valve grinder that can be set or adjusted quickly to adapt it to valves having heads of different diameters, valves having heads of different bevels and valves having stems of different lengths and diameters. And still another object is to provide a grinding machine that comprises a plurality ofrenewable grinding disks which-are so constructed that at least one disk will always be ready for service.

Other objects and desirable features of my invention will be hereinafter pointed out.

Figure 1 of the drawings is a side elevational view of a valve grinder constructed in accordance with my invention; and Fig. 2 is a top plan view of said grinder.

Referring tothe drawings, which illustrate the preferred form of my invention, A. designates a rotatable grinding member of disk form which is preferably provided with a plurality of renewable grinding disks or grinding surfaces that will be hereinafter described, said member A being secured to a shaft 1 that is driven by any suitable means, the shaft 1 of the machine herein illustrated being provided with a pulley 2 that is adapted to cooperate with a driving belt 2 The machine is adapted to be used for grinding a puppet valve which, as is well known, consists of a disk-shaped head or: provided with a beveled edge y and having a stem 2 that is arranged at right angles to said head. The machine comprises means for holding the valve in such a position with relation to the grinding member A that the vertical side face of said member will grind the beveled surface y on the head of the valve, and cause the valve to rotate, during the grinding operation. Said means is so constructed that the valve can be moved with relation to the grinding member A during the grinding operation, so as to prevent the grinding surface on said member from becoming excessively Worn at one point, and said means is also so constructed that it can be easily adjusted to receive valves of different sizes, or different bevels and having valve stemsof different lengths and diameters.

In the preferred form of my invention, as herein shown, the valve-holding means previously referred to comprises a rockable member B arranged to be moved about an aXis extending parallel to and located some distance below the axis of rotation of the grinding member A, and an adjustable valve holder on said rockable member that holds the valve in such a position with relation to the vertical grinding surface to on the side face of the member A that said grinding surface will grind the beveled surface y on the head of the valve and cause the valve to rotate during the grinding operation. The valve holder just mentioned may be formed in various ways without departing from the spirit of my invention, but I prefer to form said valve holder in the manner herein illustrated, wherein the body portion of the valve holder consists of a shaft 3 that is oscillatingly mounted on the rockable member B, so as to enable the valve carried by the valve holder to be moved toward and away from the vertical grinding surface w of the grinding member A. The shaft 3 that constitutes the body portion of the valve holder is provided with right-angularly-disposed arms 4: and 5, and said arms are provided with means that cooperate with the head and the stem of the valve to secure the valve to the holder. The arm 4; is preferably integrally connected to the shaft 3, and the arm 5 is adj ustably mounted on said shaft so that it can be moved toward and away from the arm 4, and thus permit valves having long and short stems to be mounted in the holder. The arm 4 is provided with a tapered pin or projection 6 that is adapted to enter the center opening in the head of the valve, and

the arm 5 has adjustably mounted therein a socket member 7 that is adapted to receive the outer end of the stem of the valve. The

socket member 7 herein shown is provided valve accurately in the holder, and thuscause it to revolve truly during the grinding operation. The portions of the arm 5 through which the shaft 3 and the socket member 7 pass are preferably split, as shown in Fig. 1, and clamping screws 9 and 9 are provided for drawing the split portions of said arm into snug engagement with the shaft 3 and socket member 7, and thus cause the arm 5 to be held securelyin adjusted position on the shaft 3 and also cause the socket member 7 to be held securely in ad'- justed position on said arm. If desired, the portion of the socket member 7 in which the centering device 8 is threaded can be split, and a collar 10 provided with a clamping screw 10 can be arranged on the rear end portion of-said socket member, as shown in Figs. 1 and 2, so as to securely clamp the member. 8 after it has been adjusted in proper position. The shaft 3 that constitutes the body portion of the valve holder is mounted loosely in bearings 11 carried by a plate 12 that is adjustably connected to the rockable member B by means of a clamping nut 13, so as to enable the plate 12 and-the Valve holder carried by said plate to be turned with relation to the rockable member B when it is desired to vary the angle between the head of the valve and the grinding surface to of the member A, as is necessary when valves having beveled surfaces y of different angles are ground in the machine. In order to assist the operator in setting the plate 12 properly, .I have provided the periphery of said plate and the periphery of the disk-shaped member B on which said plate turns with cooperating marks or lines 14, as shown in Fig. 1, that indicatethe proper position of the plate 12 for valves of various bevels. It is immaterial, so far as my invention is concerned, how the rockable member B is mounted, so long as said member is arranged in such a manner that when it is rocked about its axis, the valve being ground will be moved toward and away from the axis of the grinding member A, and thus prevent the grinding surface 11) of said member from becoming excessively worn at one point. In the machine herein shown the base plate 15 of the machine is provided with an upwardly-proj'ecting portion 15 to which the rockable member B is pivotally connected by means of bolts or other suitable fastening devices 16,

said bolts 16 being arranged parallel to and some distance below the shaft 1 to which the grinding member A is secured.

In using the machine the valve to be ground is arran ed in operative position in the valve holder y inserting the stem of the valve in the socket member 7, and the projection 6 on the arm 4: of the valve holder in the center opening in the head of the valve and then tightening the device 8, which causes the valve to be accurately centered in the holder. Thereafter, the shaft 3 of the valve holder is oscillated in the bearings 11 so as to move the beveled edge portion y of the valve into engagement with the vertical grinding surface w on the grinding member A, and during the grinding operation the member B is rocked on its axis so as to move the valve back and forth across the grinding surface w of the grlnding member, and thus prevent said grinding surface from becoming excessively worn at one point.

After the valve has been ground, the shaft 3 of the valve holder is swung in the opposite direction, so as to move the valve out of engagement with the grinding member. If the valve being ground has a head of large diameter it will be necessary to move the shaft 3 longitudinally of the bearings 11 in which it is mounted, so as to position the head of the valve properly with relation to the grinding member A, but this does not necessitate loosening any screws or bolts, owing to the fact that the shaft 3 of the valve holder is mounted in the bearings 11 in such a manner that it can be turned in said bearings and also moved longitudinally of same. If the valve to be ground has a long stem or a short stem, the valve holder can be changed quickly to accommodate the valve by simply loosening the clamping screw 9 in the arm 5 and moving said arm longitudinally of the shaft 3 into the proper position. No change in the adjustment of the machine is necessary to adapt it to valve stems of different diameters, in view of the fact that the socket member 7is provided with a plurality of bores of different diameters, the act of inserting the stem of the valve in the socket member 7 causing the end of the valve stem to slip into the bore in the member 7 that corresponds to the diameter of the valve stem.

A mechanism of the character above described not only holds the valve in proper position with relation to the grinding member, but it also insures the valve rotating continuously during the grinding operation, owing to the fact that the point of contact between the beveled edge on the head of the valve. and the grinding surface 10 of the grinding member is so located that the head of the valve tends to drag on the grinding surface w instead. of rotating freely thereon.

In other words, the point of contact between the valve and the grinding surface w is sufficiently off center or out of alinement with the radius of the grinding member to cause the grinding surface w to grind down the beveled surface 3 of the valve and also cause the valve to revolve about the center line of the valve stem as an axis, while the head of the valve is arranged in engagement with the grinding member. a

A workman of only ordinary skill can grind a puppet valve accurately with a rinding machine of the construction above described, on account of the fact that no skill on the part of the workman is required to hold the valve in proper position with relation to the grinding member. Any standard valve can be ground quickly and easily in such a machine, as the only change in the adjustment of the machine to adapt it to a long stemmed valve or a short stemmed valve is to change the position of the arm 5 on the shaft 3. When valves having stems of about the same length are being ground it is not necessary to change the in view of the fact position of the arm 5, that the socket member 7 is adjustably mounted in said arm, and moreover, is provided with an adjustable device 8 that is adapted to be forced into engagement with the end of the stem of the valve, so to accurately center the valve in the valve holder.

While it is immaterial, so far as my broad idea is concerned, how the grinding member A is constructed, I prefer to provide said member A with a plurality of renewable grinding surfaces which are soconstructed that one grinding surface will always be in condition for service. In order to acc0mplish this, I form the grinding member A from a plurality of disks 17, each of which is provided on its opposite side faces with pieces of emery cloth, carborundum or other abrasive sheet material that is secured to the disk by some suitable adhesive. After the grinding surface on the front disk 17 has become worn, said disk is turned over,

so as to bring the grinding surface on the other side of said disk into operative position, and after said grinding surface has become worn the abrasive material is removed from both faces of the disk and fresh pieces of abrasive material are lued or secured to same by some suitab e adhesive. Said disks 1? are then transposed on the shaft 1 and are clamped securely together by the clamping nut 18 on the shaft 1. thus causing the pieces of abrasive material that have just been applied to the disk to be pressed tightly against same while the ad hesive is drying. This is a very desirable feature of a disk type grinding machine, as it overcomes the necessity of stopping Work with the machine while waiting for the adhesivethat secures the abrasive material to the disk 17 to dry.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is: j

1. A device for grinding puppet valves consisting of a rotatable grinding member having a grinding surface on one of its side faces, and an adjustable valve, holder con-, structed to receive valves having heads and stems of different sizes, said holder being arranged in such a position with relation to said grinding member that the beveled edge on the underside of the head of the valve being ground will drag sufficiently on the side face of said grinding member to insure rotation of the valve.

2. A device for grinding puppet valves consisting of a rotatable grinding member, a valve holder arranged in such. a position with relation to said grinding member that the beveled edge on the underside of the head of the valve being ground will drag sufiiciently on the side face of said member to insure rotation of said valve during the grinding operation, and means for enabling the relative position of said valve and grindiiig member to be changed during the grinding operation so as to prevent the grinding member from becoming excessively worn at one point.

3. A grinderfor puppet valves provided with a valve holder that has a centering device for the head of the valve, and a support for the stem of the valve.

4. A grinder for puppet valves provided with a valve holder that has a centering device for the head of the valve, and a support for the stem of the valve arranged in longitudinal alinement with said centering device and spaced some distance from same, said holder being so constructed that it can be moved to carry the head of the valve therein into and out of engagement with the side face of the grinding member.

5. A valve grinder provided with a valve holder that comprises a socket member for receiving the stem of the valve being ground, said socket member having a plurality of bores of different diameters.

6. A valve grinder provided with a valve holder that comprises a centering device that is adapted to enter the center opening in the head of the valve and a socket member for receiving the stem of the valve, and an adjustable device in said socket member that is adapted to be moved into engagement with the end of the stem of the valve.

7. A valve grinder provided with a, valve holder that comprises a centering device that is adapted to enter the center opening in the head of the valve and a socket member for receiving the stem of the valve, an adjustable device in said socket member that is adapted to be moved into engagement ltd with the end of the stem of the valve, and means for locking said adjustable device in adjusted position.

8. A valve grinder, comprising a rotatable grinding member having a grinding surface on one side of same, a valve holder comprising a body portion arranged at an angle to the side grinding surface of said member and adapted to be moved toward and away from said grinding surface, and means on said body portion for holding a valve.

9. A valve grinder provided with a valve holder that comprises a body portion which is adapted to be moved to carry the valve thereon into and out of engagement with the grinding member, a socket member adjustably mounted on said body portion for receiving the stem of the valve, and means on said body portion for centering the head of the valve.

10. A valve grinder provided with a valve holder that comprises a rockable element arranged at an angle to the operative face of the grinding member, an adjustable support on said element that is adapted to be moved longitudinally of same, and a socket member adj ustably mounted in said support for receiving the stem of the valve being ground.

11. In a grinding machine, a rotatable grinding member having a grinding surface on one side of same, a rockable holder for supporting the element being ground, which holder is adapted to be oscillated so as to move said element into and out of engagement with the side face of said grinding member, and means for enabling said holder to be moved bodily so as to change the relative position of the grinding member and the element on which it is operating.

12. In a grinding machine, a rotatable grinding member, a work-supporting mechanism comprising a rockable member, and a work holder oscillatingly mounted on said member.

13. In a grinding machine, a rotatable grindingmember, a rockable support, and

'an oscillating work holder on said support that can be moved longitudinally of the axis about which it rocks.

14. A grinding machine provided with a disk-shaped rotatab1e grinding member, a rockable member arranged at one side of the axis of rotation of said member, and a work holder carried by said rockable member and arranged at an angle to the operative surface of said grinding member.

15. In a grinding machine, a disk-shaped rotatable grinding member a rockable member arranged at one side of the axis of rotation of said member, and a work holder oscillatingly mounted on said rockable member in such a manner that it can be moved longitudinally of its axis.

16. A grinding machine provided with a disk-shaped rotatable grinding member, a rockable member whose axis extends parallel to the axis of rotation of said grinding member, bearings carried by said rockable member, an oscillating shaft reciprocatingly mounted in said bearings, and means carried by said shaft for supporting the Work being ground.

In testimony whereof I hereunto affix my signature in the presence of two witnesses, this twenty-third day of March, 1916.

PAUL J. MoCULLOUGI-I.

Witnesses:

WELLS L. CHURCH, GEORGE BAKEWELL. 

